Disk clutch facing and process of making same



W. ACHTMEYER. DISK CLUTCH FACING AND PROCESS OF MAKING SAME. APPLICATION FILED MAR 10, 1921.

1,429,266,, I PatentedSept. 19, 1922 WITNESSES INVENTOR iaw A TTOR/VEYS a resi and such cotton may be easil Patented Sept; 19,1922.

DISK CLUTCH FACING AND PROCESS OF MAKING SAI EE.

Appltcatibn filed March 10, 1921. Serial No. 451,844

To all whom it my concern:

Be it known that 1 WILLIAM 'Aori'r- MEYER a citizenof the United States, and dent of Middletown, in the county of Middlesex and State of Connecticut, have made certain new and useful Improvements in Disk Clutch Facin s and. Processes of Making Same, of whic the following is a specification. My invention relates to the manufacture of improved jclutch facings and especially those of the disk type and the object thereof is to produce a pro not which is non-inflammable unaffected by Water, oil and heat which is practically unbreakable under service, and which has a high temperature of carbonization and which has a smooth and gradually increasing action.

A number of difierent clutch facings have been sug sted, made generally. from asbestos we bing' on account of its cheapness. These facings are shaped from straight asbestos webbing into a circle and are impre nated with some compound and baked. 11 order to spin asbestos fiber into yarn or to weave it into webbing, it is necessary to mix at least 25% of cotton fiber therewith on account of the brittleness of the latter, burned or charred by the .heat which is eveloped by friction. Ordinarily the facings are made from straight asbestos web sha ed into rin form which weakens the outside edge an thickens the inner edge which therefore very easil puckers. uch rings cannot be made en less, the ends must be fastened together by staples or stitches which however, do not prevent therings from losing their shape. are not as smooth as desired and will not produce an absolutely smooth gradually increasing action without jerking.

The clutch facings heretofore made from I asbestos sheets or molded from asbestos fiber, are also unsatisfactory .as they are brittle and break easily and swell and soften under the action of heat and do not operate smooth] In asbestos sheets or boards made on a paper machine the fibers run arallel to each other and longitudinally o the'sheet. I found that clutch facings made frorrif uch sheets break and crack very easily an always longitudinall parallel to the fibers. I make my clutch acings of two thin rings The surfaces of these linings impregnated with a condensation product such as that described in my application Serial No. 451 342, or my application Serial No. 451,345, filed Mar. 10, 1921, preferably- Serial No. 451,342, the rings being cut from asbestos sheets such as described above and theme the fibers of one lying at an angle, prefers 1 ablly a right angle, to those of the other. v

ferring to the drawings: Figure l is a perspective View of one of In rings.

igure'2. shows a broken separated view of the two parts of my ring, and

Figure 3 a cross section on the line 3-3 of Figure 1.

The rings 1 and 2 may be stamped from the same sheet, one r1ng being turned through 90 with respect to the other.v

These two rings maybe separately impreg-' nated with my compound and then cement-j ed together and heat hardened. My 0011- densation product ma be used as the cement. The fibers 3 o the ring 1, run at a right angle to the fibers 4 of the ring'2. I 8

make my impregnated composition as dee scribed in my application Serial No.451,342,

and it consists of a condensation product of henol and formaldehyde, the reaction taking place with sodium tungstatc. By the process therein described I obtain a thin fluid anhydrous condensation product which can be hardened by heatat atmospheric pressure. My rings 1 and 2 consisting entirely of asbestos which have been impregnated, are superposed one on the other and then placed in a heated oven.

125 to150 C. whereupon myimpregnated compound becomes hard, infusible and insoluble, but requires further heat treatment to develop qualities which are useful in a clutch faclng. The temperature is further 'increased to about 225 to 250 C.

The heatv 'is slowly increased from 100 C. to about whereupon smoke is evolved and at about 275 to 300 C. all the volatile substances have been driven ofi, whereupon the aractual use, and their action is .a gradually increasing one. While I have shown my only. a .very small percentage of breakage.

aceidentall-y dropped on stone floors with I claim:

1. A clutch facing comprising two' asbestos rings, the fibers of one ring lying at an angle to the fibers'of the other.v

2. A clutch facing consisting of two sheets. consisting entirely of asbestos, the fibersv of one sheet lying in a direction at an angle to the other sheet. I r

3. Av clutch .facing COII1 pI lS1Ilg,tVYO -asbestos rings, the fibers of one ring lylng at an angle to thefibers of the other, the whole compounded into a unitary mass by a phenol condensation product.

4a. Aclutch' facin consisting of two sheets consistingpnti-relyt f asbestos, the fibers of one sheet lying ina direction atan angle to the other sheet, the wholeiQompounded into a unitary mass by a phenol condensation product.

' 5. The process of making a clutch facing- Which consists in cutting rings from an as--'- .vbestos sheet having its fiber substantially parallel and treating said rings With a f-phenolic condensation product and superposing one ring on another, the fibers of the of the other ring and in heating the rings together gradually to 300 at atmospheric pressure.

6. A. clutch facing comprisin formaldehyde containing some sodium tungstatep 7; A clutch facing consisting of asbestos and a condensation product obtained by causing a reaction between phenol and formaldehydein the-presence of sodium'tungstate.

WILLIAM ACHTMEYER.

-one rlng' running at anangle to the fibers asbestos 1 and a condensation product of p enol and 

